Transcript Nervous System & Endocrine System PP Notes

Nervous System:
Fast messages that don’t
last long
Endocrine System:
Slow messages that last a
long time
The Nervous System:
Sends messages quickly but they don’t last long.
Broken into two parts:
Central nervous
system
Peripheral
nervous system
Sympathetic and parasympathetic divisions
of the nervous system
Summary of autonomic
differences
Autonomic nervous system controls physiological arousal
Sympathetic
division (arousing)
Pupils dilate
Parasympathetic
division (calming)
EYES
Pupils contract
SALIVATION
Increases
Perspires
SKIN
Dries
Increases
RESPIRATION
Decreases
Accelerates
HEART
Slows
Inhibits
DIGESTION
Activates
Secrete stress
hormones
ADRENAL
GLANDS
Decrease secretion
of stress hormones
Decreases
Interneuron
3 Types of Neurons
1. Sensory – Receive incoming
sensory info from sensory
organs & sends it to brain.
2. Interneuron – Carry
information between
neurons. Brain & Spinal
Cord mostly composed of
these.
3. Motor – Send messages out
from brain to muscles &
glands.
The Reflex
Works by bypassing the brain so you can react quicker.
Sensory Neuron
Interneuron
Motor Neuron
A Neural Chain
A Neural Chain
A Neural Chain
A Neural Chain
A Neural Chain
A Neural Chain
Neural Networks
The Brain Modifies Connections As We Learn & Problem Solve
Dendritic Growth Strengthens Neural Connections
The more it is used, the stronger it gets
Endocrine System
Uses hormones that travel through the bloodstream.
Takes longer to get there but lasts a long time